How to eliminate explicit "null" values

Hello,
I am having a problem in eliminating the explicit "null" values while retrieving them from the database.
Here is my problem as follows,
For the optional fields in a form i am explicitly entering "null" as value or else it is throwing null pointer exception in linux. While i am trying to display the values existing in a table it is displaying fine when i use this condition
if(varialble.equals("null") ||varialble.equals("") || variable.equals(null))
varialble = "";
else
out.println(variable)
But when i use the same for the values i retrieve from the view it is displaying "Null" for the explicit "null" values and null from implicit null values.
Please help me out how to remove the explicit null values. It would be great help if somebody replies me at the earliest.
Thanks in advance
daya

the following is the code which i am using to retrieve values.
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.io.*;
import StrChk.*;
public class DataSearch extends HttpServlet
 Connection con=null;
 Statement st=null;
 ResultSet rs=null;
 ResultSetMetaData rsmd=null;
 PrintWriter out=null;
 public void doPost(HttpServletRequest req, HttpServletResponse res)
 throws IOException,ServletException
 String key;
 String sql;
 res.setContentType("text/html");
 out = res.getWriter();
 try
 Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
 con = DriverManager.getConnection("jdbc:odbc:daya","daya","daya");
 st = con.createStatement();
 catch(Exception e)
 System.out.println("Error Accessing DataBase:"+e);
 key = req.getParameter("key");
// Search(str1.retString(key));
 Search(key);
 public void Search(String key)
 int res=0;
 boolean flag=true,found=false;
 StringTokenizer strt = new StringTokenizer(key, " ");
 String sql;
 String str1,str2;
 int i=0;
int count = strt.countTokens();
String keywords[] = new String[count+1];
 keywords=key;
 i++;
 if(count > 1)
 count++;
 while(strt.hasMoreTokens())
 keywords[i] = strt.nextToken();
 i++;
 out.println("<html><title>DataSearch</title>");
 out.println("<script>");
 out.println("function myclose(){ self.close(); } ");
 out.println("</script><body>");
 for(i=0; i<count && flag==true; i++)
 try
 /* sql = "select ";
 sql += " nvl(\"Topic Title\",' '), ";
 sql += " nvl(\"Name\",' '), ";
 sql += " nvl(\"Title\",' '), ";
 sql += " nvl(\"Affiliation\",' '), ";
 sql += " nvl(\"Street Name\",' '), ";
 sql += " nvl(\"City\",' '), ";
 sql += " nvl(\"State\",' '), ";
 sql += " nvl(\"Country\",' '), ";
 sql += " nvl(\"Zip Code\",' '), ";
 sql += " nvl(\"Phone\",' '), ";
 sql += " nvl(\"Fax\",' '), ";
 sql += " nvl(\"eMail\",' '), ";
 sql += " nvl(\"Web Site\",' ') ";
 sql += " from SEARCHVWUSERDET where ";
 sql += " lower(\"Name\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"Title\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"Affiliation\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"Street Name\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"City\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"State\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"Country\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"eMail\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"Web Site\") like " + "lower('%" + keywords[i] + "%')";*/
 sql = "select ";
 sql += " nvl(\"Name\",' '), ";
 sql += " nvl(\"Title\",' '), ";
 sql += " nvl(\"Affiliation\",' '), ";
 sql += " nvl(\"Street Name\",' '), ";
 sql += " nvl(\"City\",' '), ";
 sql += " nvl(\"State\",' '), ";
 sql += " nvl(\"Country\",' '), ";
 sql += " nvl(\"Zip Code\",' '), ";
 sql += " nvl(\"Phone\",' '), ";
 sql += " nvl(\"Fax\",' '), ";
 sql += " nvl(\"eMail\",' '), ";
 sql += " nvl(\"Web Site\",' '), ";
 sql += " nvl(\"Key Words\",' ') ";
 sql += " from searchcombi where ";
 sql += " lower(\"Name\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"Title\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"Affiliation\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"Street Name\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"City\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"State\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"Country\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"eMail\") like " + "lower('%" + keywords[i] + "%') or ";
 sql += " lower(\"Web Site\") like " + "lower('%" + keywords[i] + "%') or";
 sql += " lower(\"Key Words\") like " + "lower('%" + keywords[i] + "%')";
 sql += " order by \"Name\" ";
 rs = st.executeQuery(sql);
 //out.println(sql);
 if(rs.next())
 if(i == 0)
 flag=false;
 found=true;
 res=0;
 do
 res++;
 }while(rs.next());
 out.println(res++);
 out.println("<center>Searched for \""+ keywords[i]+"\", ");
 out.println("Total Matches found : "+res+"</center> ");
 rs = st.executeQuery(sql);
 while(rs.next())
 res++;
 out.println("<table width=600 align=center>");
 str1 = disp(rs.getString(1),keywords[i]);
 out.println(str1);
 //if(str1.equals("null") || str1.equals(" ") || str1.equals(null))
 if(str1 == "null" || str1 == "")
 str1 = "";
 else
 out.println("<tr><td width=150>Name </td><td>"+str1+"</td></tr>");
 //System.out.println(str1);
 //out.println(str1);
 str2="";
 str1 = disp(rs.getString(2),keywords[i]);
 if(!str1.equals("") || !str1.equals(""))
 str2 = str1;
 str1 = disp(rs.getString(3),keywords[i]);
 if(!str1.equals(" ") || !str1.equals(""))
 if(str2.length() > 0 || !str2.endsWith(", "))
 str2+= ", ";
 str2 += str1;
 if(!str2.equals(""))
 out.println("<tr><td width=150>Title, Affiliation</td><td>");
 out.println(str2);
 out.println("</td></tr>");
 str2="";
 str1 = disp(rs.getString(4),keywords[i]);
 if(!str1.equals(" ") || !str1.equals(""))
 str2 = str1;
 str1 = disp(rs.getString(5),keywords[i]);
 if(!str1.equals(" ") || !str1.equals(""))
 if(str2.length() > 0 || !str2.endsWith(", "))
 str2+= ", ";
 str2 += str1;
 str1 = disp(rs.getString(6),keywords[i]);
 if(!str1.equals(" ") || !str1.equals(""))
 if(str2.length() > 0 || !str2.endsWith(", "))
 str2+= ", ";
 str2 += str1;
 str1 = disp(rs.getString(7),keywords[i]);
 if(!str1.equals(" ") || !str1.equals(""))
 if(str2.length() > 0 || !str2.endsWith(", "))
 str2+= ", ";
 str2 += str1;
 str1 = disp(rs.getString(8),keywords[i]);
 if(!str1.equals(" ") || !str1.equals(""))
 if(str2.length() > 0 || !str2.endsWith(", "))
 str2+= ", ";
 str2 += str1;
 if(!str2.equals(""))
 out.println("<tr><td valign=top width=150>Address </td>");
 out.println("<td>");
 out.println(str2);
 out.println("</td></tr>");
 str1 = disp(rs.getString(9),keywords[i]);
 if(!str1.equals(" ") || !str1.equals(""))
 out.println("<tr><td width=150>Phone</td><td>"+str1+"</td></tr>");
 str1 = disp(rs.getString(10),keywords[i]);
 if(!str1.equals(" ") || !str1.equals(""))
 out.println("<tr><td width=150>Fax</td><td>"+str1+"</td></tr>");
 str1 = disp(rs.getString(11),keywords[i]).toLowerCase();
 if(!str1.equals(" ") || !str1.equals(""))
 out.println("<tr><td width=150>eMail</td><td>"+str1+"</td></tr>");
 str1 = disp(rs.getString(12),keywords[i]).toLowerCase();
 if(str1.equals("null") || str1.equals(" ") || str1.equals(null))
 str1="";
 else
 out.println("<tr><td width=150>Web Site</td><td>"+str1+"</td></tr>");
 str1 = disp((rs.getString(13)).replace(',',' '),keywords[i]);
 if(str1 == "null" || str1 == null || str1 == "")
 //if(!rs.wasNull())
 out.println("nothing");
 else
 out.println("<tr><td width=150>Key Words</td><td>"+str1+"</td></tr>");
 out.println("<tr><td width=150><hr></td><td><hr></td></tr>");
 out.println("</table> ");
 } // end while
 } // end if
 catch(Exception e)
 System.out.println("Exception while executing query: "+ e);
 } // end for
 if(!found)
 out.println("<center>Searched for \""+ key+"\", ");
 out.println("Total Matches found : 0</center> ");
 out.println("<center><a href=\"javascript:myclose()\">Close</a></center>");
 out.println("</body></html>");
 public void doGet(HttpServletRequest req, HttpServletResponse res)
 throws IOException,ServletException
 doPost(req,res);
 public String disp(String str1, String str2)
 int i,j,k;
 boolean found=false;
 String s1,s2,s3;
 String t1,t2;
 t1 = initCap(str1);
 s1 = t1.toLowerCase();
 s2 = str2.toLowerCase();
 for(i=0;i<s1.length() && !found ;i++)
 k=i;
 for(j=0;j<s2.length() && k < s1.length() && s1.charAt(k) == s2.charAt(j) ;j++,k++);
 if(j==s2.length())
 found=true;
 if(found)
 i--;
 s3 = t1.substring(0,i);
 s3 += "";
 s3 += t1.substring(i,i+str2.length());
 s3 += "";
 s3 += t1.substring(i+str2.length(),t1.length());
 else
 s3 = t1;
 return s3;
 public String initCap(String str)
 StringTokenizer st = new StringTokenizer(str," ");
 String s1="";
 String s2="";
 String s3="";
 String s4="";
 while(st.hasMoreElements())
 s1 = (String)st.nextElement();
 if(s1.length() > 0)
 s2 = s1.substring(0,1);
 s2 = s2.toUpperCase();
 if(s1.length() > 1)
 s3 = s1.substring(1,s1.length());
 s2 += s3;
 s4 +=" "+s2;
 return s4;

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P3W2 COMM CNTRL ISAM 213 12870.4
P3W3 COMM CNTRL ISAM 213 245.88
P3W1 COMM CNTRL ISAM 273 72831.2
P3W2 COMM CNTRL ISAM 273 8739.38
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P3W3 COMM CNTRL TAM 216 2027.1
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P3W3 COMM CNTRL TAM 273 19707.42
P3W1 Damon Walters -609.07
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P3W3 Damon Walters 37475.1
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P3W2 COMM CNTRL ISAM 213 12870.4
P3W3 COMM CNTRL ISAM 213 245.88
P3W4 COMM CNTRL ISAM 213
P3W5 COMM CNTRL ISAM 213
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P3W2 COMM CNTRL ISAM 273 8739.38
P3W3 COMM CNTRL ISAM 273 3764.92
P3W4 COMM CNTRL ISAM 273
P3W5 COMM CNTRL ISAM 273
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P3W2 COMM CNTRL TAM 213 20515.17
P3W3 COMM CNTRL TAM 213 16167.46
P3W4 COMM CNTRL TAM 213
P3W5 COMM CNTRL TAM 213
P3W1 COMM CNTRL TAM 273 -3336.71
P3W2 COMM CNTRL TAM 273 -1376.68
P3W3 COMM CNTRL TAM 273 19707.42
P3W4 COMM CNTRL TAM 273
P3W5 COMM CNTRL TAM 273
P3W1 Damon Walters -609.07
P3W2 Damon Walters 30030.24
P3W3 Damon Walters 37475.1
P3W4 Damon Walters
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Sure, in a Single SQL ->
satyaki>
satyaki>select * from v$version;
BANNER
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37 and week_num = m.week_num
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43 from (
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47 union all
48 select 3 from dual
49 union all
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51 union all
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54 (
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56 from week_tab
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58 ) m;
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select * from temp_table;Edited by: GVR on Dec 1, 2010 8:27 AM

I like case expression B-)
The same question of my homepage http://www.geocities.jp/oraclesqlpuzzle/7-81.html
with temp_table(cd1,cd2,cd3,cd4,cd5,id1,id2,id3,id4,id5) as(
select 'A1' ,'A2' ,null,'A4'   ,null ,'i1' ,'i2'   ,null,'i4'   ,null     from dual union all
select 'A11',null ,null,'A44' ,'A55' ,'id11',null   ,null,'id44' ,'id55'   from dual union all
select null,'A111',null,null   ,'A555',null ,'id111',null,null   ,'id555' from dual union all
select 'A' ,null ,null,'A1111','E55' ,'id11',null   ,null,'id111','id1111' from dual)
select
case when SumCD1 = 1 then CD1
     when SumCD1+SumCD2 = 1 then CD2
     when SumCD1+SumCD2+SumCD3 = 1 then CD3
     when SumCD1+SumCD2+SumCD3+SumCD4 = 1 then CD4
     when SumCD1+SumCD2+SumCD3+SumCD4+SumCD5 = 1 then CD5 end as CD1,
case when SumCD1+SumCD2 = 2 then CD2
     when SumCD1+SumCD2+SumCD3 = 2 then CD3
     when SumCD1+SumCD2+SumCD3+SumCD4 = 2 then CD4
     when SumCD1+SumCD2+SumCD3+SumCD4+SumCD5 = 2 then CD5 end as CD2,
case when SumCD1+SumCD2+SumCD3 = 3 then CD3
     when SumCD1+SumCD2+SumCD3+SumCD4 = 3 then CD4
     when SumCD1+SumCD2+SumCD3+SumCD4+SumCD5 = 3 then CD5 end as CD3,
case when SumCD1+SumCD2+SumCD3+SumCD4 = 4 then CD4
     when SumCD1+SumCD2+SumCD3+SumCD4+SumCD5 = 4 then CD5 end as CD4,
case when SumCD1+SumCD2+SumCD3+SumCD4+SumCD5 = 5 then CD5 end as CD5,
case when SumID1 = 1 then ID1
     when SumID1+SumID2 = 1 then ID2
     when SumID1+SumID2+SumID3 = 1 then ID3
     when SumID1+SumID2+SumID3+SumID4 = 1 then ID4
     when SumID1+SumID2+SumID3+SumID4+SumID5 = 1 then ID5 end as ID1,
case when SumID1+SumID2 = 2 then ID2
     when SumID1+SumID2+SumID3 = 2 then ID3
     when SumID1+SumID2+SumID3+SumID4 = 2 then ID4
     when SumID1+SumID2+SumID3+SumID4+SumID5 = 2 then ID5 end as ID2,
case when SumID1+SumID2+SumID3 = 3 then ID3
     when SumID1+SumID2+SumID3+SumID4 = 3 then ID4
     when SumID1+SumID2+SumID3+SumID4+SumID5 = 3 then ID5 end as ID3,
case when SumID1+SumID2+SumID3+SumID4 = 4 then ID4
     when SumID1+SumID2+SumID3+SumID4+SumID5 = 4 then ID5 end as ID4,
case when SumID1+SumID2+SumID3+SumID4+SumID5 = 5 then ID5 end as ID5
from (select cd1,cd2,cd3,cd4,cd5,id1,id2,id3,id4,id5,
      nvl2(cd1,1,0) as SumCD1,
      nvl2(cd2,1,0) as SumCD2,
      nvl2(cd3,1,0) as SumCD3,
      nvl2(cd4,1,0) as SumCD4,
      nvl2(cd5,1,0) as SumCD5,
      nvl2(id1,1,0) as SumID1,
      nvl2(id2,1,0) as SumID2,
      nvl2(id3,1,0) as SumID3,
      nvl2(id4,1,0) as SumID4,
      nvl2(id5,1,0) as SumID5
      from temp_table)
order by cd1,cd2,cd3,cd4,cd5;
CD1   CD2    CD3   CD4   CD5   ID1    ID2    ID3     ID4   ID5
A     A1111 E55   null null id11   id111 id1111 null null
A1    A2     A4    null null i1     i2     i4      null null
A11   A44    A55   null null id11   id44   id55    null null
A111 A555   null null null id111 id555 null    null nullMy SQL articles of OTN-Japan
http://www.oracle.com/technology/global/jp/pub/jp/ace/sql_image/1/otnj-sql-image1.html
http://www.oracle.com/technology/global/jp/pub/jp/ace/sql_image/2/otnj-sql-image2.html

How to give not null value in a rule for a field

hi,
i want to create a rule through rule designer where i want a field say "country" should not be left blank. when i go to the rule designer and select country through attribute value i get 2 conditions "=" and "!=" what shoud i give the value as so that the country field is not null.
TIA

I don't think you can have null value in the rule designer , rather you can created one more UDF and populate this UDF with something based on the nulllness/not-null of the country field and use this new UDF in the rule .
Hope this helps .
Thanks
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How to update the null values to some number on the NUMBER type of column

Hello All,
I have one NUMBER type of column in DB table. It has some (null) values. I want to update with value 1. I tried to run the Update statement , It gives 0 rows updated.
SELECT objectid,attr20 FROM table;
object id attr20
====== ====
fff70b67-8d54-4ad7-bc57-7b40a0d8b219     (null)
cac5264a-b363-487b-bfe6-6b84d60064e9     (null)
2fc2a626-51d8-401c-9495-18aacd4c35c8     (null)
1b60bfa4-ff68-4488-adf6-2a83528c0e20     (null)
1c662829-24c1-4b3c-9289-0128e170c043     5
74f11331-545b-435f-bf4b-f57c7a6b4500     2
c941c1ac-a18e-47ec-843c-dbe2a5b51001     0
d7eba203-93c0-48ea-a109-9b06015ef387     0
eba72fa3-21d8-4489-bb93-917ebbd67de2     0
I ran following query but no success.
UPDATE eb_tcsservfnadoc SET attr20 = 1 WHERE attr20 = NULL
0 rows updated
UPDATE eb_tcsservfnadoc SET attr20 = 1 WHERE attr20 = null
0 rows updated
UPDATE eb_tcsservfnadoc SET attr20 = 1 WHERE attr20 = ''
0 rows updated
UPDATE eb_tcsservfnadoc SET attr20 = 1 WHERE attr20 =' '
Error starting at line 1 in command:
UPDATE eb_tcsservfnadoc SET attr20 = 1 WHERE attr20 =' '
Error report:
SQL Error: ORA-01722: invalid number
01722. 00000 - "invalid number"
*Cause:
*Action:
can some one help me out to update such values ????

Hi,
"=" will not work for NULL values. Please remeber two NULL values are NOT same. Try IS operator.
UPDATE eb_tcsservfnadoc SET attr20 = 1 WHERE attr20 IS NULLRegards,
Avinash

How to put the null value at the last of a select list

Hello,
I have a select list with a null value, I want the null value to be the last value in the list. It always appears in the top of the list, Desc and Asc order is not working.
Thank you in advance!
Edited by: Najla on Apr 1, 2013 10:37 PM

Hi,
Edited by: Howard (... in Training) on Apr 2, 2013 1:xx PM
The statement - I don't think it is possible to arrange the order of the null option in a select list.- is close. You can't control the order of the Null value if you add the Null value through the GUI. However, it can be added and controlled as part of a SELECT ...
One way is to add NULL to the "SELECT". Here the Yes/No are hard-coded but they could have been selected from a table:
select d, r from
select 'YES' d, 'Y' r from dual
union all
select 'No' d, 'N' r from dual
union all
select Null d, '<Null>' r from dual
) order by 1 desc NULLS lastHoward

How to check for null value/field?

Hi!
I have created a form that is designed to calculate the rows using the FormCalc function.
My problem is that if I have no value in the some of the rows, a 0 is automatically display as the calculated output field. If a row has no data, how can I get a null or blank field in the result (calculated field) field?
Let's say, I have 5 rows and each row should have a calculated value in one of the fields; when I fill out only two of the rows, the remaining three rows come out with 0s in the calculated output field. I need a blank output field for the remaining calculated values instead of 0s. I am a newbie so please excuse me if I am not explaining well.
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